The key 0x5A is common; other variants use 0xAA , 0xFF , or a 16-byte keystream. You may need to brute force the key using the mstar_xor_bruteforce.py script.
python mstar_repack.py -c mstar_v6 -o new_firmware.bin output_dir/ mstar-bin-tool-master
: While powerful, it is a command-line tool. New users may find it challenging without a guide, as it requires manual configuration of .ini files for repacking. The key 0x5A is common; other variants use
Command line tools to pack/unpack MStar bin firmware. Currently available tools: Unpack MStar bin firmware files. The key 0x5A is common